Two or more nouns are sometimes used consecutively, with the second modifying the first. For instance, I recently received a mail whose subject was "Honorarios migración." This is, I suppose, ...
Is there any difference? What's their usage? When should one be used instead of the other one? Examples: El niño debe de hacer su tarea. El niño debe hacer su tarea.
I have the following sentence in English Do your children like to read? Which translates to Spanish: ¿ A vuestros hijos les gusta leer? To me it is unclear, why I have to use "A vuestros" ...